This is a stylized procedural planet generator written in Godot 3.0. It creates oceans, lakes, icy mountains, forests, etc.
The algorithm is based on some article I found many years ago, unfortunately I lost the link to it. If anyone knows where it is, let me know. The idea is as follows:
pin the icosphere: if the dot product between
pis positive, move
pa little away from the origin. Else, move it a little towards the origin.
After that, trees are planted. A probablity distribution is generated over the entire set of vertices, where the probability of placing a tree depends on the elevation of a vertex. A vertex below sea level has probablity 0, so no trees are placed below sea level, and the probablility increases when reaching "average" elevation, and then slowly drops off to zero again in the icy mountain range.